15. To create and stimulate this hunger and thirst in us, and to bring us to the attainment of full knowledge, God kindly sends upon his Christians temptation, sorrow and affliction. These preserve them from carnal satiety and teach them to seek comfort and help. So God did also in former ages, in the time of the martyrs, when he daily suffered them to be violently seized in person and put to death by sword, fire, blood and wild beasts. In this way he truly led his people to school, where they were obliged to learn to know his will and to be able defiantly to say: "No, O tyrant, O world, devil and flesh, though you may injure me bodily, may beat or torment me, banish me or even take my life, you shall not deprive me of my Lord Jesus Christ—of God's grace and mercy." So faith taught them and confirmed to them that such suffering was God's purpose and immutable will concerning themselves, which, whatever attitude towards them he might assume, he could not alter, even as he could not in the case of Christ himself. This discipline and experience of faith strengthened the martyrs and soon accustomed them to suffering, enabling them to go to their death with pleasure and joy. Whence came, even to young girls thirteen and fourteen years old, like Agnes and Agatha, the courage and confidence to stand boldly before the Roman judge, and, when led to death, to go as joyfully as to a festivity, whence unless their hearts were filled with a sublime and steadfast faith, a positive assurance that God was not angry with them, but that all was his gracious and merciful will and for their highest salvation and bliss?
16. Behold, what noble and enlightened, what strong and courageous, people God produced by the discipline of cross and affliction! We, in contrast, because unwilling to experience such suffering, are weak and enervated. If but a little smoke gets into our eyes, our joy and courage are gone, likewise our perception of God's will, and we can only raise a loud lamentation and cry of woe. As I said, this is the inevitable condition of a heart to which the experience of affliction is unknown. Just so Christ's disciples in the ship, when they saw the tempest approach and the waves beat over the vessel, quite forgot, in their trembling and terror, the divine will, although Christ was present with them. They only made anxious lamentation, yet withal cried for help: "Save, Lord; we perish!" Mt 8, 25. So also in the time of the martyrs, many Christians became timid and at first denied Christ from fear of torture or of long confinement in prison.
17. It is God's will that we, too, should learn to accustom ourselves to these things through temptation and affliction, though these be hard to bear and the heart is prone to become agitated and utter its cry of woe. We can quiet our disturbed hearts, saying: "I know what is God's thought, his counsel and will, in Christ, which he will not alter: he has promised to me through his Son, and confirmed it through my baptism, that he who hears and sees the Son shall be delivered from sin and death, and live eternally."
18. Now, what Paul calls being filled with the knowledge of the divine will in Christ through the faith of the Gospel, means faith in and the comfort of the forgiveness of sins, since we have not in ourselves the ability to fulfil his will in the ten commandments. This knowledge is not a passive consciousness, but a living, active conviction, which will stand before the judgment of God, contend with the devil and prevail over sin, death and life.
19. Now, the heart possessing such knowledge or faith is kindled by the Holy Spirit and acquires a love for and delight in God's commandments. It becomes obedient to them, patient, chaste, modest, gentle, given to brotherly kindness, and honors God in confession and life. Thus it is increasingly filled with the knowledge of God's will; it is armed and fortified on all sides to withstand and defeat the flesh and the world, the devil and hell.